Published 08-25-09, Control # 077-04 4-39
RT9130E SERVICE MANUAL BOOM
BI-FOLD SWINGAWAY BOOM EXTENSION
Description
A 18m (59 ft) two stage, offsetable swingaway boom
extension is provided to obtain additional boom reach. The
fly swingaway section is a 7m (23 ft) section. The base
section is a 11m (36 ft) section.
The boom extension mounts directly to the boom nose
utilizing a four point attachment. In addition, the swingaway
can be stowed on the right side of the boom base section.
Removing the attach pins from the attach points on the left
side of the boom nose allows the swingaway to be rotated
and stowed on the right side of the boom base section.
The 7m (23 ft) section weighs approximately 400 kg (882
pounds) and the 11m (36 ft) section weighs approximately
1000 kg (2205 pounds).
Maintenance
Removal
NOTE: If an adequate lifting device is available, the
swingaway boom extension can be dismounted
directly from the side of the boom.
1. Fully extend and set the outriggers.
2. Position the boom over the front.
3. If extended, fully retract all the boom sections and lower
the boom to minimum elevation to permit ease of
installation of pins and access to the boom nose.
NOTE: The auxiliary boom nose (rooster sheave) must be
in stowed position or removed.
4. Pull downwards against the spring force of the eye bolt
and fold out the guide rail and release the eye bolt to
lock the guide rail in the out position (Detail B)
(Figure 4-7).
NOTE: If removing the 7m section (fly) with the 11m
section (boom extension base) skip to step 10. If
not removing the 7m section (fly) with the 11m
section (boom extension base), perform steps 5
thru 9 and skip steps 10 and 11.
5. At the rear boom extension support bracket (Detail C)
(Figure 4-7) remove the two retainer clips from the two
attach pins and remove attach pins from the 11m section
to the 7m section (fly) attaching connection.
6. Stow the pins on the fly section in the stowage lugs.
7. Ensure the pins attaching the fly section to the boom
base section rear extension support bracket (Detail C)
(Figure 4-7) are in place.
8. Ensure the pin and retaining pin attaching the fly section
to the guide rail bracket (Detail B) (Figure 4-7) is in
place.
9. At the fly section sheave end (Detail D) (Figure 4-7)
swivel the catch hook out to release the latch allowing
the 11 m section to separate from the fly at the sheave
end.
10. Remove the retaining pin and pin attaching the 7m
section (fly) to the guide rail bracket (Detail B)
(Figure 4-7) and place in holding bracket.
11. Remove the retaining clips and attach pins connecting
the 7m section (fly) to the boom base section rear
stowage bracket (Detail C) (Figure 4-7).
12. Swing the 11m section extension (pivoting on the front
boom extension stowage connection, (Detail A)
(Figure 4-7) until contact is made between the main
boom anchor lugs and the 11m extension anchoring
holes. Align the boom anchor lugs with the 11m
extension anchors. Remove the retaining pins from the
front of the 11m extension and hammer the two short
pins into the anchoring lug holes securing the extension
to the right side of the boom nose.
13. On the front boom extension stowage bracket, remove
the clip pin and retaining pin and place in pin holder (see
detail A). Lift the lever and hold it, push the spring latch
out and let the lever rest on the spring latch.
14. Attach a length of rope to the swingaway tip to aid in
swinging the 11 m section into place ahead of the boom
nose.
DANGER
Before attempting to erect or stow the boom extension,
read and strictly adhere to all danger decals installed on
the swingaway and stowage brackets.
DANGER
Always secure the boom extension with a guide rope on
the main boom before removing any connections to
prevent uncontrolled swinging of boom extension.
CAUTION
If the 7m section (fly) is not to be removed, it should
remain on the stowage brackets on the side of the boom.
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